In GDB, how do I execute a command automatically when program stops? (like display)

Question

I want some commands to be automatically executed each time the program stops, just like what display does with x. How do I do that?

Answer 1

Here's the easy way I found out:

define hook-stop
  ...commands to be executed when execution stops
end

Refer to this page for details: http://sourceware.org/gdb/current/onlinedocs/gdb/Hooks.html#Hooks

Answer 2

Another "new" way to do it is with the Python Event interface:

 def stop_handler (event):
     print "event type: stop"

 gdb.events.stop.connect (stop_handler)

which will trigger the stop_handler function each the the inferior stops.

There are two other similar events type:

events.cont
events.exited

respectively triggered when the inferior is continued or exists.